Spark-plug.



D.'E. PHINNEY.

SPARK-PLUG.

APPLICATION FILED AUG-25, 1916.

Patented Mar. 12, 1918.

DELBERT E. PHINNEY, OF BARTLESVILLE, OKLAHOMA.

srAnK-rLoe.

Specification of Letters Patent.

Patented Mar.'12, 1918.

Application filed August 25, 1916. Serial No. 116,820.

To an whom it may concern:

Be it known that I, DELBERT E. PHINNEY, a citizen of the United States, residing at Bartlesville, in the county of Washington and State of Oklahoma, have invented certain new and useful Improvements in Spark- Plugs; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention has for its object to pro vide an improved spark plug embodying novel features of detail whereby the connection between the center electrode of the plug and the lead wire from the magneto or other source of electromotive force is effectively insulated from the other parts of the explosive engine.

Another object is the provision of a spark plug which may be conveniently cleaned of carbon or other deposits upon the electrodes thereon by simply rubbing these parts over a block or sheet of abrasive material.

With these and other objects in view the invention consists in the novel construction, combination, and arrangement of parts as will be hereinafter specifically described,

claimed, and illustrated in the accompany-' ing drawing, in which- Figure 1 represents a side elevation of the improved spark plug.

2 represents a view therethroug'h, 1

.Fig. 3 represents a top plan view of the p r P Fig. 4 represents a transverse sectional view on the line 4- 1 of Fig. 2,

Fig. 5 represents a bottom plan view of the spark plug.

Referring to the drawing in detail, wherein similar reference numerals designate corresponding parts throughout the several views, the numeral 5 indicates the body of the improved spark plug which is preferably of hollow formation and is reduced at one end as indicated at 6 and provided with external screw threads adapted to fit the internal screw threads, of the spark plug receivin opening of an explosive engine (not shown? plug is preferably of polygonal formation whereby it may be conveniently gripped in the jaws of a wrench or other tool to facilitate the removal and application from and to the cylinder of the engine.

vthe electrode 10 may be rotated.

longitudinal sectional The relatively large end of the body The relatively small end 6 of the plug body is beveled as indicated at 7 and is formed with an internal shouldler 8 which is inclined to the longitudinal axis of the body and constitutes a stop for one end of the insulator 9 in which is secured the center electrode 10. One end of the electrode 10 is formed with an enlarged head 11 which is arranged in spaced relation with the beveled edge portion 7 of the hollow body thereby providing. a spark gap. The head 11 is formed with a diametrical slot 12 to receive a screw driver or other bladed tool whereby A substantially V-shaped connecting member 13 is formed in its diverging legs with internally screw threaded apertures, in one of which is adjustably fitted the externally screw threaded extremity of the electrode 10 whereby the latter is secured in position in the insulator 9. The opposite leg of the connecting member 13 receives a binding screw 14 whereby an electrical wire (not shown) is'secured in position thereon. The end of the bore of the body 5 at the relatively large end thereof is enlarged and is formed with internal screw threads in which is fitted a ring nut 16 having a diametrical slot 16 adapted to receive a spanner wrench whereby the ring nut16 is advanced to the proper position within the body 5. The insulator 9 is formed with an inclined shoulder 15 against whichthe ring nut 16 is advanced in order to secure the insulator in position in the body. I

A tubular insulator 17 constructed of porcelain or other suitable insulating material is threaded in the relatively large end of the body 5 and is engaged against the outer surface of the ring nut 16. The outer portion of the insulator 17 projects beyond the adjacent terminal of the insulator 9 and completely incloses the connecting member 13 and that portion of the electric wire which is secured by the screw 14:. The insulator 17 may be conveniently moved independently of the ring nut 16 to facilitate attachment or adjustment of the screw 14: and the wire secured thereto.

As clearly shown in Fig. 2, the head of the center electrode 10, the adjacent terminal of the insulator 9' and the bevelededge 7 of the terminate in the same plane and it will thus be seen that a deposit of carbon or other material covering the entire end of the plug may be conveniently removed therefrom by rubbing the plu over a block or sheet of abrasive materia What is claimed is A spark plug comprising a body having a reduced portion, an insulator disposed within said body and having an enlarged portion positioned within the reduced portion of the body, said insulator having ashore, an electrode extending through the bore and having one end screw threaded, a head formed on the other end of the electrode and having a groove therein to receive a screw for turning the electrode, a V-shaped connecting member threaded to the electrode by rotatmesses ing the same by said tool, a ring nut thread ed in the enlarged portion of the body and bearing against the enlarged portion of the insulator, said nut having a slot to receive a tool for turning said nut against the insulator, and a cylindrical insulator threaded to the body against said nut and housing the connecting member.

In testimony whereof I aflix my signature in presence of two witnesses.

DELBERT E. PHINNEY. Witnesses:

M. E. MmHAELsoN, A. S. EBY. 

